: You must have a valid license for TIA Portal V13 SP1 base. Update 4 is free, but it does not replace the base license.
: The update introduced new, memory-optimized versions of fail-safe S7-1200 and S7-1500 instructions, including License Compatibility : Improved compatibility for the STEP 7 Safety Basic V13 SP1 license Additional Changes & Support Stability Fixes Tia Portal V13 Sp1 Update 4